Method and apparatus for adjusting cardiac event detection threshold based on dynamic noise estimation
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United States of America Patent
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Aug 16, 2016
Grant Date -
Oct 2, 2014
app pub date -
Jun 17, 2014
filing date -
Oct 18, 2004
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Abstract
An implantable cardiac rhythm management (CRM) device includes a sensing and detection circuit that senses at least one cardiac signal and detects cardiac electrical events from the sensed estimation. The sensed cardiac signal is filtered to produce a filtered cardiac signal having a signal frequency band and a noise signal having a noise frequency band. The noise frequency band is substantially different from the signal frequency band. A dynamic noise floor is produced based on the noise signal and used as the minimum value for the detection threshold. A cardiac electrical is detected when the amplitude of the filtered cardiac signal exceeds the detection threshold.
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